Cash Dividends Declared (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2011
Dividend Per Share	$ 0.34	$ 0.30	$ 0.24
Total Dividend Amount	$ 21,736	$ 19,878	$ 16,701
November 2, 2011
Declaration Date		Nov. 02, 2011
Record Date		Dec. 08, 2011
Payment Date		Jan. 10, 2012
Dividend Per Share		$ 0.15
Total Dividend Amount		10,039
May 14, 2012
Declaration Date		May 14, 2012
Record Date		Jun. 21, 2012
Payment Date		Jul. 12, 2012
Dividend Per Share		$ 0.15
Total Dividend Amount		9,794
November 8, 2012
Declaration Date	Nov. 08, 2012
Record Date	Nov. 30, 2012
Payment Date	Dec. 19, 2012
Dividend Per Share	$ 0.17
Total Dividend Amount	10,913
May 16, 2013
Declaration Date	May 16, 2013
Record Date	Jun. 07, 2013
Payment Date	Jun. 28, 2013
Dividend Per Share	$ 0.17
Total Dividend Amount	$ 10,823